We've done a several of them and enjoyed them all.
The two times we've done Chef Mickey's Donald Duck was greeting people in the lobby, posing for photos and signing autographs. Mickey, Goofy, Minnie, Chip and Dale were circulating.
At Cinderella's Gala Feast we saw the Fairy Godmother in the lobby, while Cindy, Prince Charming and the mice, Perla and Suzy circulated.
At the Princess Breakfast we saw Princess Aurora (Sleeping Beauty), Snow White, Mulan, Bell and Jasmine.
Pooh, Eeyore, Tigger and Piglet were at the Crystal Palace, while Donald, Mickey, Goofy and Pluto were at Donald's Breakfastosaurus in Animal Kingdom (Restaurantosaurus in Dinoland).
If your DD doesn't have a favorite character I'd pick the character meal based on the restaurant's menu.